When I run Repair Disk (from Disk Utility) on my iBook, I get the message "incorrect number of threads". It looks like it tries to repair it, then it starts over, and I get the same message again. Lather, rinse, repeat. I have also tried booting into single-user mode and running fsck. Every run tells me it made repairs. I never get the message that the HD is okay. Do I have any other options before I wipe the disk clean and reload the OS?